Mystery Bird Revealed

I first heard it and went to the deck to find out what was making all that racket.  Then I spied it in the mulched landscape bed across the street.

I thought it might be a turkey hen from behind, but when it turned around

and started coming toward me, I realized I could not identify it.

It had wattles like a turkey but not the fanned tail.  It was large and it was noisy.

It started across the street and up the hill. I heard it was in the neighbor's yard across the cul-de-sac from our house.  That's when I found out it was a guinea hen. Amazing bird--but where did it come from--and alone?  Mystery bird's identity revealed but source still a secret.